It is a programming language, whose name stands for A Programming Language. It was developed by Kenneth Iverson, with the goal of coming up with better notation for mathematicians that wish to program computers. Many times, the word APL is used to refer to array programming in general, or to the family of array programming languages. In many dialects, APL requires the use of a special APL keyboard that is full of symbols not easily found on a keyboard. Nowadays, people have made alternatives that only use easily-accessible symbols; examples of such are called J and K.